Group endpoints now support cancellation_policy_id, allowing partners to set or update a cancellation policy when creating or modifying a group. The field is optional; if not provided, the existing policy is retained without modification. Cancellation policy IDs can be retrieved via GET /hotels/{id}/cancellation_policies.

If an invalid cancellation_policy_id is submitted, the request fails with HTTP 422.

Example request:

{
  "cancellation_policy_id": 48291
}